Tenma 72-7210 Function Generator
Quick Guide
The Tenma 72-7210 Function generator is a single output repetitive function generator.
It is capable producing a sine, triangle or square wave with an adjustable frequency and
amplitude. The waveform symmetry and base amplitude voltage can be modified, as
well as setting the frequency up to sweep between to limits at an adjustable rate.
Display and Display mode:
The frequency output display can be set to display the output frequency of the function
generator or can be used to measure an external digital frequency.
The ON button switches the display to the external counter
mode. With the button left out, the display will show the value
of the internal frequency generator.
The display indicates the frequency and the lit indicator to the right of the display
indicates the frequency range.
Frequency setting:
The output frequency is controlled by a combination of two controls. The range buttons
switch the range of the output, rotating through setting from (1560) mHz [.001 to .560 Hz] up through (3.6 – 6.2) MHz. Some
ranges have multiple settings. An example of this is the KHz
range selection has 3 selections, each increasing a decade.
The frequency value within the selected range is adjusted by the use of the vernier knob
located below the display. This is a continuously adjustable knob
that allows the adjustment of the frequency anywhere within the
selected range.
Waveform Shape:
The waveform shape is selected by three buttons located at the bottom of the face.
Pressing one of these three buttons allows you to select
either a sine wave, triangle wave or square wave.
In addition to the basic wave shape, it is possible to modify
the waveform by using one or more of the two OFFSET
and SYMMETRY functions.
The OFFSET function allows the user to adjust where the
zero crossing point of the repetitive waveform is. This can
be adjusted either positive or negative. (note that this
control and the amplitude control will interact with each
other.) Leaving the button below the control out will
disable this function.
The SYMMETRY function will allow you to cause the output wave to be non-symmetric.
As an example the triangle wave can be skewed to be a sawtooth in either direction, or
anyplace in between the two extremes. Leaving the button below the control out disables
this function.
Amplitude Control and Output:
The AMPLITUDE vernier adjusts the
peak to peak value of the output signal
within the limits. Selecting the -20dB
button will lower the output range
allowing lower peak to peak values.
The OUTPUT connector is the location
that the signal is actually generated on.
This is where you will connect to the unit to obtain your useable signal.
Sweep Mode:
In addition to the basic signal, this unit has the ability to “sweep” the base frequency
through some range. The SWEEP
controls are the portion that controls this.
Under normal operation the two buttons
are left out, disabling this function. When
pressed, the ON button starts the sweep
mode. The STOP button allows the display to show what the upper level of the sweep
frequency is set to. This is adjusted by the STOP FREQ vernial knob. The sweep mode
will vary the output signal from the base frequency to the stop frequency. The rate of this
change is selected with the RATE vernier.